Better-Bottle makes a plastic installation tube for installing Carboy Racking Adapters in 5 or 6 gallon Better-Bottle carboys. In a pinch, it is also possible to use a 50 cm (20") length of 1/4" diameter steel (plated or stainless) rod or running thread or a 44 cm (18") length of 3/8" inside diameter (clearance) rigid tubing, both of which can be purchased at most hardware stores.